"We need leadership from the White House -- and over the past four years, President Barack Obama has taken major steps to reduce our carbon consumption, including setting higher fuel-efficiency standards for cars and trucks," wrote Bloomberg in an editorial for Bloomberg View. "His administration also has adopted tighter controls on mercury emissions, which will help to close the dirtiest coal power plants (an effort I have supported through my philanthropy), which are estimated to kill 13,000 Americans a year."

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UPDATE: In a statement, President Obama said he was "honored" to have the endorsement of the mayor.

“While we may not agree on every issue, Mayor Bloomberg and I agree on the most important issues of our time - that the key to a strong economy is investing in the skills and education of our people, that immigration reform is essential to an open and dynamic democracy, and that climate change is a threat to our children's future, and we owe it to them to do something about it. Just as importantly, we agree that whether we are Democrats, Republicans, or independents, there is only one way to solve these challenges and move forward as a nation - together. I look forward to thanking him in person - but for now, he has my continued commitment that this country will stand by New York in its time of need. And New Yorkers have my word that we will recover, we will rebuild, and we will come back stronger.”